Loud-speaker



1 1931- L. F. CURTIS ET AL 1.792.822

LOUD SPEAKER Filed April 29, 1930 2' Sheets-Sheet 1 [BY/f F 61/75/75 INVENTOR ATTORNEY Feb; 17, 1931.

L. F. CURTIS ET AL LOUD SPEAKER Filed April 29, 1930 2 Sheets-Sheet 2 l NVENTORS Qw ATTORNEY Patented Feb. 17, 1931 UNITED STATES PATENT -OFFICE LESLIE F. CURTIS AND MARION E. BOND, OF SPRINGFIELD, MASSACHUSETTS, ASSIGN- ORS TO AMERICAN BOSCH MAGNETO CORPORATION, OF SPRINGFIELD, MASSACHU- SETTS, A CORPORATION OF NEW YORK LOUD-SPEAKER Application filed April 29,

sound waves.

The primary object of this invention is to provide a loud speaker of the character designated which is particularly adapted for use in motor vehicle radio receiver installations and portable receivers. Such a speakor must be small, compact, suitably encased to protect the working parts, be readily attachable, and have good acoustic properties. Our speaker has all these characteristics, and a preferred embodiment thereof is illustrated in the accompanying sheets of drawings, wherein:

Fig. 1 is a face view or front elevation; Fig. 2 is a sectional view on the line 22 of Fig. 1; Fig. 3 is a rear view or elevation; and F ig. 4. is a side elevation showing the speaker mounted to a Wall of a radio receiver. I

The speaker comprises an electromagnetic driving unit 1 actuating a conical diaphragm 2. For the purposes of the instant application the driving unit may be of any usual type, since this member forms no part of the present disclosure. The periphery of the cone is provided with a flexible liaison member 3 which is secured by screws 4:, 4, or otherwise, between a flange 5 on housing 6 and the baffle 7 of protective shield 8.

The shield 8 is conical in shape and covers the diaphragm to protect it from injury. The shield is apertured 9, 9 to pass the sound waves generated by the diaphragm. The shield is provided with the bafile which is employed for the purpose for which baffles are usually employed in such cases. Preferably the batfle is integral with the shield and to increase the rigidity of the battle as well as to increase the efi'ective baffling area the same is provided with a flange 10 bent at an angle to the bafile 7.

The housing 6 encases the driving unit and is provided with apertures 11, 11 for the emission of the sound waves generated in the rear of the diaphragm.

To prevent dirt, moisture and other un- 1930. Serial No. 448,270.

desirable matter from getting into the electromagnetic unit, there is placed over the housing a cloth cap or bag 12 which is closed tightly about the housing by a purse-string 13. The housing is provided with projecting lugs 14, 14: which prevent the inadvertent removal ofthe bag from the housing.

The baflle provides a convenient means for mounting the speaker. One way in which we mount the speaker is to secure it to a wall of a radio receiver 15 as shown in Fig. 4. For this purpose the baffle is provided with apertures 16, 16 in which are disposed rubber bushings 17,17. Thereceiver is provided with bolts 18, 18 which pass through the bushings and the speaker is secured to the bolts by nuts 19, 19.

Having described our invention, what we claim is:

1. A loud speaker comprising a driving unit, a diaphragm actuated thereby, a shield protecting said diaphragm and having a balfle portion integral therewith, and a plurality of bushings disposed about said bafile.

2. A loud speaker comprising a driving unit, a housing therefor, a diaphragm actuated by said unit, a flexible liaison member on said diaphragm, and a shield protecting said diaphragm and having a bafile portion integral therewith, said liaison member being between said housing and said shield and said housing and shield being secured to each other.

3. A loud speaker comprising a driving unit, a housing therefor, a diaphragm actuated by said unit, a flexible liaison member on said diaphragm, a shield protecting said diaphragm and having a baflie portion integral therewith, said liaison member being being secured between said housing and said shield, said housing and shield being secured to each other, and a plurality of bushings disposed about said baffle.

In witness whereof, we affix our signatures.

LESLIE F. CURTIS. MARION E. BOND. 

